AttributeError:部分初始化的模块“”cv2“”没有属性“”CascadeClassifier“”(很可能是由于循环导入)“

# moduleA.py
import moduleB

def functionA():
    moduleB.functionB()

# moduleB.py
import moduleA

def functionB():
    moduleA.functionA()

# moduleA.py
def functionA():
    import moduleB
    moduleB.functionB()

# moduleB.py
def functionB():
    import moduleA
    moduleA.functionA()

pip show opencv-python

pip install --upgrade opencv-python

import cv2

# 加载预训练的人脸检测模型
face_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_frontalface_default.xml')

# 读取图像
image = cv2.imread('path_to_image.jpg')
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

# 检测人脸
faces = face_cascade.detectMultiScale(gray, scaleFactor=1.1, minNeighbors=5, minSize=(30, 30))

# 绘制矩形框
for (x, y, w, h) in faces:
    cv2.rectangle(image, (x, y), (x+w, y+h), (255, 0, 0), 2)

# 显示结果
cv2.imshow('Faces found', image)
cv2.waitKey(0)
cv2.destroyAllWindows()